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There is concern that climate change will have very negative affect on human life and the environment. One concern is the availability of food source. Farmers are starting to see a decrease in some crops because of warmer climates. Both agricultures and fisheries are dependent on certain climate condition. Although warmer temperatures and CO2 are good for some crops to grow in some places, you need to follow other conditions such as nutrient levels, soil moisture, and water available. Frequent climate changes make it extremely difficult to grow crops, raise animals, and catching fish. Some crops will produce more with more carbon dioxide in the air. There will also be an Increase of water temperature harming fisheries and wild seafood population. Having too much CO2 in the atmosphere will make oceans more acidic. This is bad for some fish, like shellfish (crabs, lobsters, etc), whose shells can be worn away by acid and there whole ecosystems might be harmed too.
Global warming will also make water difficult to give to livestock which will cause dehydration and mass death in livestock population. If you have twice as much CO2, then you could get 30% more crop from wheat and soybeans and other crops, like corn, won't increase so much. Part of the whole global warming thing is that it usually goes along with an increase of CO2 in the atmosphere. This could be a potential benefit from global warming except If the temperatures also go up too much, that will stop crops from growing. Most plants have an "optimal" temperature level where they'll grow really well. So if the temperatures get hot, they'll stop growing very well for that reason.
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